…one of the justifications for Protestants today revising and rejecting the classical theism of Nicaea and subsequent Nicene developments is the assertion that the Reformers did not subject the doctrine of God to the same rigorous examination in light of scripture as they did other doctrines, such as justification or the sacraments.
Those who make such an assertion demonstrate an incompetent grasp of history. Yes, it is true that the Reformers did maintain the classical doctrine of God. But we cannot conclude from this simple fact that this was because they did not subject it to their view of scripture as the norming norm.
…It is mischievous because the argument that the Reformers did not sufficiently reform the doctrine of God is typically deployed by someone who wants to justify their own significant revision of the classical position while yet seeming to be orthodox and Protestant. The move is thus rhetorically very clever: It allows the one repudiating the content of the Reformers’ theology to present that repudiation as if it is simply a more faithful and consistent application of the Reformers‘ method. In short, he claims to reject the Reformation doctrine because he honors the Reformation spirit.
It is ill-informed because it appears to be ignorant of the pattern of doctrinal discussion in the Reformation. The early Reformation writings of numerous Reformers – most notably Melanchthon and Calvin – do reveal significant hesitancy in deploying the fine-tooled technical language of classical Trinitarianism.
Carl Trueman, “A Most Mischievous and Ill-Informed Half Truth” 11 February 2019